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To advance from milli-arcsecond to micro-arcsecond astrometry, time keepingcapability and its comparison among different stations need to be improved andenhanced. The T2L2 (Time transfer by laser link) experiment under developmentat OCA and CNES to be launched in 2008 on Jason-2, allows the synchronizationof remote clocks on Earth. It is based on the propagation of light pulses inspace which is better controlled than the radio waves propagation. In thispaper, characteristics are presented for both common view and non-common viewT2L2 comparisons of clocks between China and France.

Time transfer by laser link between China and France